Height adjustment arrangement for seats, particularly motor vehicle seats

Claim 1

A height adjustment arrangement for a seat, particularly a motor vehicle seat with a seat portion raisable and lowerably relative to a vehicle floor and having a frame and a longitudinal side, the arrangement comprising a guide track device fixable on the vehicle floor and having a track runway; a plurality of pivotable supports, each having one end portion arranged at a fixed height relative to a vehicle floor and another end portion hingedly connectable with a seat portion, each of said supports having an upper end and a lower end; means for moving said pivotable supports and including a rotatable threaded spindle and a non-rotatable nut engaging with said spindle; a plurality of pairs of separate supporting elements including a first supporting element pivotally connected with said upper end of each of said supports and mounted on said seat portion and a second supporting element pivotally connected with said lower end of each of said supports and arranged at a fixed height relative to the vehicle floor, said second supporting elements being mounted on said track runway of said guide track device, said first and second seat supporting elements being formed as first and second angular supporting claws, respectively, said first supporting claws being pivotally mounted on one end of the respective pivotable supports and connectable with the frame of the seat portion, said second supporting claws supporting said pivotable supports and being mountable on the track runways of the guide track; and a bearing block connected with said second supporting claws, said threaded spindle being axially immovably retained on the longitudinal side of the seat in said bearing block.